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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2014
EARNINGS PER SHARE [Abstract] |
Components of basic and diluted earnings per share | The following table presents the components of basic and diluted earnings per share of common stock for the three months and six months ended June 30, 2014 and 2013 (in thousands, except per share amounts):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Net earnings attributable to Kirby |  | $ | 74,992 |  |  | $ | 63,093 |  |  | $ | 137,238 |  |  | $ | 119,671 |
Undistributed earnings allocated to restricted shares |  |  | (435 | ) |  |  | (459 | ) |  |  | (806 | ) |  |  | (859 | )
Income available to Kirby common stockholders - basic |  |  | 74,557 |  |  |  | 62,634 |  |  |  | 136,432 |  |  |  | 118,812 |
Undistributed earnings allocated to restricted shares |  |  | 435 |  |  |  | 459 |  |  |  | 806 |  |  |  | 859 |
Undistributed earnings reallocated to restricted shares |  |  | (434 | ) |  |  | (457 | ) |  |  | (803 | ) |  |  | (856 | )
Income available to Kirby common stockholders - diluted |  | $ | 74,558 |  |  | $ | 62,636 |  |  | $ | 136,435 |  |  | $ | 118,815 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 57,010 |  |  |  | 56,752 |  |  |  | 56,957 |  |  |  | 56,712 |
Weighted average unvested restricted stock |  |  | (331 | ) |  |  | (413 | ) |  |  | (334 | ) |  |  | (407 | )
Weighted average common stock outstanding - basic |  |  | 56,679 |  |  |  | 56,339 |  |  |  | 56,623 |  |  |  | 56,305 |
Dilutive effect of stock options |  |  | 190 |  |  |  | 190 |  |  |  | 203 |  |  |  | 188 |
Weighted average common stock outstanding - diluted |  |  | 56,869 |  |  |  | 56,529 |  |  |  | 56,826 |  |  |  | 56,493 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.32 |  |  | $ | 1.11 |  |  | $ | 2.41 |  |  | $ | 2.11 |
Diluted |  | $ | 1.31 |  |  | $ | 1.11 |  |  | $ | 2.40 |  |  | $ | 2.10 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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